Sand molding apparatus.



E. H. MUMPORD. SAND MOLDING APPARATUS.

APPLICATION FILED 1,111.2, 1912.

1,091,948. Patented Mar.31, 1914.

EDGAR H.

MUMFOB D, 0F PLAINFIELD, NEW JERSEY, ASSIGNOR T0 SAMUEL C.

MUMFOBD, or nnTnoIT, MICHIGAN.

sum) MOLDING APPARATUS.

LQEH 34%.

Specification of Letters Patent.

Patented Mar. 31, 1914.

Application filed January ,2, 1912. Serial No. 668,925.

To all whom it may concern:

Be it known that I, a citlzen. of the United States, residing at Plainfield, New Jersey, have invented certain new and useful Improvements in Sand.

Molding Apparatus, of which the following is a specification.

The invention has reference to sand molding apparatus, and relates particularly to mechanism for use in connection with jolt ramming apparatus for ramming the sand in the upper portion of the mold flask.

Among the primary objects of the invention the provision of improved ramming;

wherein all theare; apparatus sand in the the provision of an improved apparatus whereby the sand in the upper portion of the mold flask is uniformly rammed or packed; and the provision in jolt ramming apparatus of an improved butt ramming mechanism which uniformly rams the sand in the flask at each impact of the jolt ramming by virtue of its inertia. These together with such other objects as may hereinafter appear, or are incidental to my invention I attain by means of a construction illustrated in preferred form in the accompanying drawings, wherein Figure 1 is a side elevation of a jolt ramming apparatus with my improved but-t 'amming apparatus shown in section; and Fig. 2 is a plan view partly broken away, of the butt ramming apparatus.

In'ramming or packing sand, molds by the jolt ramming method or process, it has been found difficultto provide adequate and effective means for ramming the sand in the upper portions of the flask. This portion of the sand shifts or loosens by reason of the lack of superincumbent strata, and my invention is int-ended to overcome this difficulty by the provision of apparatus which will uniformly pack or ram the sand and is of simple and light construction, thus reducing to a minimum excessive strains on the jolt ramming apparatus.

In Figure 1, I have shown the invention applied to a jolt ramming apparatus of standard construction comprising the cylinder 7, in which is mounted the usual piston 8 carrying the table 9 for supporting the mold flask 10. The upper portion of the cylinder constitutes the anvil of the machine, and the piston is actuated in the for sand molds,

mold flask is effectively rammed; butt ramming EDGAR H. Mmrronn,

usual manner by fluid pressure. Suspended above the table 9 and flask 10 is a butt rammer comprising a frame 11 in which are mounted a plurality of depending blocks 12, preferably square in cross-section, placed in juxtaposition to form contiguous bearing surfaces, each block being provided with a longitudinal slot 13 of substantial length. The blocks are slidably mounted in the frame by means of the guide rods 14 which are secured to the sides of the frame and pass through the slots 13 in the blocks.

In operation, the butt rammer is brought into position above the flask and table and lowered to substantially the position shown in Fig. 1, when the blocks abutting the flask and the sand in the flask will be slightly elevated above their normal position in the frame 11. The frame is maintained in this position and the jolt ramming mechanism is actuated. As the table and flask are raised and dropped, the blocks abutting upon the flask and sand move with them and pack the sand in the upper portion of the flask by reason of their inertia at each impact of the table on the anvil, the sand in the lower portion being packed in the usual manner by such impact.

It will be seen that the blocks present a continuous ramming surface, and one that compensates for any irregularities in the surface of the sand in the flask because of the free relative movement that each individual block has in the frame 11. The sand will thus be rammed With absolute uniformity. It will also be observed that no provision need be made for avoiding the edges and bars of the flasks, and that the device will readily accommodate itself to flasks of varying sizes and configurations. By reason of its lightness, the butt rammer can be readily manipulated and has the additional advantage that there will be but little increase of the stress on the foundry floor and jolt ramming apparatus incidental to the impact of the table. Other advantages will occur to those familiar with the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following -1. In sand molding apparatus, the combination of a jolt ramming table, a flask actuated by the jolt 'of the table, and a butt rammer above the flask comprising a frame and a plurality of blocks slidably mounted inthe frame for free relative movement With respect thereto and adapted to rest upon the sand in the flask.

2. In sand molding apparatus, the combination of a jolt ramming table, a flask, a butt rammer actuated bythe jolt of the table comprising a frame and a plurality of blocks slidably mounted in the frame for free relative movement ith respect thereto adapted to rest upon the sand in the flask, and means for supporting the frame above the flask.

In sand molding apparatus, the combination of a jolt ramming table, a flask, a butt rammer actuated by the jolt of the table comprising a frame, a plurality of blocks arranged to form a continuous surface, said blocks being mounted in the frame for free relative movement With respect thereto, and means for supporting the frame above the flask.

4. A butt rammer for jolt ramming molding apparatus comprising a frame and a plurality of blocks slidably mounted in the. frame for free relative movement With respect thereto, the rammer being actuated by the jolt of the molding apparatus.

5. A butt rammer forjolt ramming molding apparatus comprislng a frame and a M Copies of this patent may be obtained for five cents each, by addressing the plurality of blocks mounted in the frame arranged to form a continuous surface, the said blocks being mounted in the frame for free relative movement With respect thereto.

6. In sand molding apparatus, the combination of a jolt ramming table, a flask, a butt rammer actuated by the jolt of the table comprising a frame and a block slidably mounted in the frame for free relative movement with respect thereto adapted to rest upon the sand in the flask, and means independent of the block for supporting the frame above the table.

7. In sand molding apparatus, the combination of a jolt ramming table, a flask, a

butt rammer actuated by the jolt of the table comprising a frame and a plurality of blocks slidably mounted in the frame for free relative movement With respect thereto adapted to rest upon the sand in the flask, and means independent of the blocks for supporting the frame above the table.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed Witnesses.

EDGAR H. MUMFORD.

Witnesses r F. C. RICHARDS, F R. PHILLIPS.

Commissioner of Patents,

Washington, D. G. 

